281 lines
6.5 KiB
C
281 lines
6.5 KiB
C
/*
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* linux/arch/m68knommu/kernel/ints.c -- General interrupt handling code
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*
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* Copyright (C) 1999-2002 Greg Ungerer (gerg@snapgear.com)
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* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
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* Kenneth Albanowski <kjahds@kjahds.com>,
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* Copyright (C) 2000 Lineo Inc. (www.lineo.com)
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*
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* Based on:
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*
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* linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/kernel_stat.h>
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#include <linux/errno.h>
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#include <linux/config.h>
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#include <linux/seq_file.h>
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#include <asm/system.h>
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#include <asm/irq.h>
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#include <asm/traps.h>
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#include <asm/page.h>
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#include <asm/machdep.h>
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/*
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* This table stores the address info for each vector handler.
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*/
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irq_handler_t irq_list[SYS_IRQS];
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#define NUM_IRQ_NODES 16
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static irq_node_t nodes[NUM_IRQ_NODES];
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/* The number of spurious interrupts */
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volatile unsigned int num_spurious;
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unsigned int local_bh_count[NR_CPUS];
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unsigned int local_irq_count[NR_CPUS];
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static irqreturn_t default_irq_handler(int irq, void *ptr, struct pt_regs *regs)
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{
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#if 1
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printk(KERN_INFO "%s(%d): default irq handler vec=%d [0x%x]\n",
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__FILE__, __LINE__, irq, irq);
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#endif
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return(IRQ_HANDLED);
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}
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/*
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* void init_IRQ(void)
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*
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* Parameters: None
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*
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* Returns: Nothing
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*
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* This function should be called during kernel startup to initialize
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* the IRQ handling routines.
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*/
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void __init init_IRQ(void)
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{
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int i;
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for (i = 0; i < SYS_IRQS; i++) {
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if (mach_default_handler)
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irq_list[i].handler = (*mach_default_handler)[i];
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else
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irq_list[i].handler = default_irq_handler;
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irq_list[i].flags = IRQ_FLG_STD;
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irq_list[i].dev_id = NULL;
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irq_list[i].devname = NULL;
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}
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for (i = 0; i < NUM_IRQ_NODES; i++)
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nodes[i].handler = NULL;
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if (mach_init_IRQ)
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mach_init_IRQ();
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}
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irq_node_t *new_irq_node(void)
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{
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irq_node_t *node;
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short i;
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for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
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if (!node->handler)
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return node;
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printk(KERN_INFO "new_irq_node: out of nodes\n");
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return NULL;
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}
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int request_irq(
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unsigned int irq,
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irqreturn_t (*handler)(int, void *, struct pt_regs *),
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unsigned long flags,
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const char *devname,
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void *dev_id)
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{
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if (irq < 0 || irq >= NR_IRQS) {
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printk(KERN_WARNING "%s: Incorrect IRQ %d from %s\n", __FUNCTION__,
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irq, devname);
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return -ENXIO;
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}
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if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
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if (irq_list[irq].flags & IRQ_FLG_LOCK) {
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printk(KERN_WARNING "%s: IRQ %d from %s is not replaceable\n",
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__FUNCTION__, irq, irq_list[irq].devname);
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return -EBUSY;
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}
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if (flags & IRQ_FLG_REPLACE) {
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printk(KERN_WARNING "%s: %s can't replace IRQ %d from %s\n",
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__FUNCTION__, devname, irq, irq_list[irq].devname);
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return -EBUSY;
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}
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}
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if (flags & IRQ_FLG_FAST) {
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extern asmlinkage void fasthandler(void);
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extern void set_evector(int vecnum, void (*handler)(void));
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set_evector(irq, fasthandler);
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}
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irq_list[irq].handler = handler;
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irq_list[irq].flags = flags;
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irq_list[irq].dev_id = dev_id;
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irq_list[irq].devname = devname;
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return 0;
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}
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EXPORT_SYMBOL(request_irq);
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void free_irq(unsigned int irq, void *dev_id)
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{
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if (irq >= NR_IRQS) {
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printk(KERN_WARNING "%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
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return;
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}
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if (irq_list[irq].dev_id != dev_id)
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printk(KERN_WARNING "%s: Removing probably wrong IRQ %d from %s\n",
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__FUNCTION__, irq, irq_list[irq].devname);
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if (irq_list[irq].flags & IRQ_FLG_FAST) {
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extern asmlinkage void inthandler(void);
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extern void set_evector(int vecnum, void (*handler)(void));
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set_evector(irq, inthandler);
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}
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if (mach_default_handler)
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irq_list[irq].handler = (*mach_default_handler)[irq];
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else
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irq_list[irq].handler = default_irq_handler;
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irq_list[irq].flags = IRQ_FLG_STD;
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irq_list[irq].dev_id = NULL;
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irq_list[irq].devname = NULL;
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}
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EXPORT_SYMBOL(free_irq);
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int sys_request_irq(unsigned int irq,
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irqreturn_t (*handler)(int, void *, struct pt_regs *),
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unsigned long flags, const char *devname, void *dev_id)
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{
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if (irq > IRQ7) {
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printk(KERN_WARNING "%s: Incorrect IRQ %d from %s\n",
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__FUNCTION__, irq, devname);
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return -ENXIO;
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}
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#if 0
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if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
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if (irq_list[irq].flags & IRQ_FLG_LOCK) {
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printk(KERN_WARNING "%s: IRQ %d from %s is not replaceable\n",
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__FUNCTION__, irq, irq_list[irq].devname);
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return -EBUSY;
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}
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if (!(flags & IRQ_FLG_REPLACE)) {
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printk(KERN_WARNING "%s: %s can't replace IRQ %d from %s\n",
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__FUNCTION__, devname, irq, irq_list[irq].devname);
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return -EBUSY;
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}
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}
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#endif
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irq_list[irq].handler = handler;
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irq_list[irq].flags = flags;
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irq_list[irq].dev_id = dev_id;
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irq_list[irq].devname = devname;
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return 0;
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}
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void sys_free_irq(unsigned int irq, void *dev_id)
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{
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if (irq > IRQ7) {
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printk(KERN_WARNING "%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
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return;
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}
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if (irq_list[irq].dev_id != dev_id)
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printk(KERN_WARNING "%s: Removing probably wrong IRQ %d from %s\n",
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__FUNCTION__, irq, irq_list[irq].devname);
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irq_list[irq].handler = (*mach_default_handler)[irq];
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irq_list[irq].flags = 0;
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irq_list[irq].dev_id = NULL;
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irq_list[irq].devname = NULL;
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}
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/*
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* Do we need these probe functions on the m68k?
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*
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* ... may be useful with ISA devices
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*/
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unsigned long probe_irq_on (void)
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{
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return 0;
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}
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EXPORT_SYMBOL(probe_irq_on);
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int probe_irq_off (unsigned long irqs)
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{
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return 0;
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}
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EXPORT_SYMBOL(probe_irq_off);
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asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
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{
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if (vec >= VEC_INT1 && vec <= VEC_INT7) {
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vec -= VEC_SPUR;
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kstat_cpu(0).irqs[vec]++;
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irq_list[vec].handler(vec, irq_list[vec].dev_id, fp);
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} else {
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if (mach_process_int)
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mach_process_int(vec, fp);
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else
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panic("Can't process interrupt vector %ld\n", vec);
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return;
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}
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}
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int show_interrupts(struct seq_file *p, void *v)
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{
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int i = *(loff_t *) v;
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if (i < NR_IRQS) {
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if (! (irq_list[i].flags & IRQ_FLG_STD)) {
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seq_printf(p, "%3d: %10u ", i,
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(i ? kstat_cpu(0).irqs[i] : num_spurious));
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if (irq_list[i].flags & IRQ_FLG_LOCK)
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seq_printf(p, "L ");
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else
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seq_printf(p, " ");
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seq_printf(p, "%s\n", irq_list[i].devname);
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}
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}
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if (i == NR_IRQS && mach_get_irq_list)
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mach_get_irq_list(p, v);
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return 0;
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}
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void init_irq_proc(void)
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{
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/* Insert /proc/irq driver here */
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}
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